Sewing-machine shuttle.



H0 MODEL.

PATBNTED MAY 3, 1904. H. A. DODGE.

SEWING MACHINE SHUTTLE.

APPLICATION FILED D30. 24, 1903.

No. 759,082, Patented May 3, 19041.

UNITED STATES PATENT OFFICE.

HENRY A. DODGE, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO CAMPBELL,

BOSWORTH MACHINERY COMPANY, OF PORTLAND, MAINE, A CORPORA- TION OF MAINE.

SEWING-MACHINE SHUTTLE.

SPECIFICATION forming part of Letters Patent No. '7 59,082, dated May 3, 1904.

Application filed December 24;, 1908. Serial No. 186,452. (No model) To all whom may concern: newal of the entire base-plate of the tension Be it known that I, HENRY A. DODGE, a citidevice is necessary when the small part therezen of the United States, residing at Boston, of subject to wear is worn out. '5 in the county of Suffolk and State of Massa- The object of the present invention is to chusetts, have invented certain new and useful avoid the disadvantages of the constructions Improvements in Shuttles; and Ido hereby deabove described; and to this end the invention clare the following to be a full, clear, and exconsists in a shuttle having a wear-plate of act description of the invention, such as will improved form secured to the shuttle-body in enable others skilled in the art to which it apsuch a way that it cannot become separated IO pertains to make and use the same. therefrom during the operation of the machine This invention relates to an im irovement and arran ed to be movable so as to )resent 1 e in shuttles for sewmg-machmes. new surfaces without the renewal of the plate.

The tension device of a shuttle as usually In the drawings, Figure 1 is a front elevamade comprises an adjustable spring arranged tion of a shuttle embodying the present in- I5 to press the shuttle-thread againstacoOperatvention, the tension device being shown in ing friction-surface, thereby subjecting it to section. Fig. 2 is a plan view of the shuttle tension when it is drawn through the device. with the tension-spring removed, and Fig. The friction-surface tends to wear and become is a similar View of the complete shuttle. grooved, particularly when made of compara- The illustrated embodiment of the inven- 20 tivcly soft material, and where the frictiontion has a hollow shuttle-body 1, in which a surface is embodied, as is the common pracbobbin of thread may be mounted. A tentice, in the body of the shuttle the grooving sion-spring 2 of ordinary form is adjustably of the surface by the thread necessitates the secured to the body by a screw 3. Holes I 7 renewal of the shuttle-body before it is in and 5 in the body serve as guides to direct 5 other respects worn out. It is impracticable, the thread under the end of the tGnSlOD-Slin'lllg', moreover, to harden the steel of which the the thread passing out'through the hole etand shuttle-body is composed or the part of the thence under the end 6 of the spring and in shuttle-body carrying the friction-surface, through the hole 5. Under the end 6 of the owing to the shocks to which the shuttle is tension-spring a socket 7 is formed in the 3 subjected in its rapid oscillation, which prebody, and in this socket is a wear-plate 8, clude the use of brittle material in the body which may be rotated therein, but is secured of the shuttle. To avoid the disadvantages against displacement therefrom both by the of such a construction, it has been proposed tension-spring and by a stem 9, projecting to embody the friction-surface in a removable from the wear-plate through the perforation 35 tension device comprising a base-plate, which 10, located centrally with respect to the socket may be renewed when worn. The plate in and headed over on the inside of the body. the proposed construction is seated in a slot The tension-spring has notches 11 to aid in in the shuttle-body and is secured in place by threading the tension device, which is accom- 8 5 screws or rivets, and the tension-springis seplished in the usual manner. The thread is 4 cured to this plate by an adjusting-screw. pressed against the face of the wear-plate, and This construction has several serious disadthe pressure may be adjusted by turning the vantages. The separable tension device he screw 3. The wear-plate is preferably made ing of substantial weight is liable to become of steel, the head being hardened and the stem 9 loosened from the shuttle-body, owing to the left soft for convenience in heading it. In

45 constant vibration, and in such case it may the preferred embodiment of the invention cause serious injury to the machine by falling the wear-plate fits loosely in the socket, and between moving parts. Moreover, the rethe stem is headed over loosely, so that the wear-plate is free to turn without the application of any considerable force. Any rotation of the wear-plate will result merely in more uniform Wear of its face, and if the plate remains long enough in one position to become grooved by the thread it may be easily turned to a new position by a screw-driver taking into the groove so produced, the tension-spring being turned aside for the purpose.

The stem serves to retain the wear-plate in place when the tension-spring is removed for any reason; but it is not an essential feature of the invention, for thewear-plate is secured in its socket during the operation of the shuttle by the pressure of the thread against it. Since the tension-spring is held in place by the adjusting-screw, accidental release of the wear-plate can occur only by the loss of this screw, which cannot occur, as any loosening of the screw will change the tension and result in an immediate readjustment by the operator.

Although in the preferred form of the invention the wear-plate and socket are round, this form is not essential, as any symmetrical form which will permit the removal of the wear-plate from the socket and its replacement in a new position presenting new wearing-surface is within the scope of the invention.

Having thus described my invention, what is claimed is- 1. A shuttle for sewing-machines, having, in combination a body provided with a socket, a wear-plate of symmetrical form fitting the socket and arranged to be turned to different positions therein, thread-guiding means arranged to direct the shuttle-thread across the face of the wear-plate, and a tension-spring arranged to press the thread against the wearplate to subject the thread to tension, substantially as described.

2. A shuttle for sewing-machines, having, in combination, a body provided with a circular socket and a perforation central therein,

a circular wear-plate fitting the socket-and having a stem passing through the perfora- HENRY A. DODGE.

WVitnesses:

HORACE VAN EVEREN, FARNUM F. DORSEY. 

